var bottomArr = document.querySelectorAll("#sw_foot>.little>a");
for(var i = 0; i < bottomArr.length; i++) {
	bottomArr[i].ind = i;
	bottomArr[i].onmouseover = function() {
		this.style.background = "url(../img/home-box-" + this.ind + "_CN_hover.jpg)";
	}
	bottomArr[i].onmouseout = function() {
		this.style.background = "url(../img/home-box-" + this.ind + "_CN.jpg)";
	}
}